A slit lamp is used to examine the:

A slit lamp is an essential instrument widely used in ophthalmology for examining the anterior segment of the eye. This includes structures such as the cornea, iris, lens, and anterior chamber. The slit lamp provides high magnification and illumination, allowing for a detailed view of these structures to help diagnose various conditions and diseases.

The anterior chamber, which is the fluid-filled space between the cornea and the iris, is particularly accessible and important to examine for any signs of inflammation, infection, or other abnormalities. This instrument's design enables eye care professionals to utilize both direct and indirect illumination to assess not only the anterior chamber but also the overall health of the anterior segment, making it a crucial tool in eye examinations.

In contrast, the extraocular muscles are examined through different methods, such as standard visual assessment and eye movement tests, rather than through a slit lamp. The optic tract and optic foramen are associated with deeper structures of the visual system, which are not evaluated using a slit lamp but rather through advanced imaging techniques or other diagnostic methods.